110kV temperature measurement type polypropylene insulation high-temperature-resistant power cable and manufacturing method thereof

Abstract

The invention belongs to the technical field of power cables, and provides a 110kV temperature measurement type polypropylene insulation high-temperature-resistant power cable and a manufacturing method thereof, and the 110kV temperature measurement type polypropylene insulation high-temperature-resistant power cable comprises a cable core arranged in the center, and a semi-conductive water-blocking buffer layer, a metal shielding layer, a semi-conductive water-blocking buffer layer, an aluminum sheath, an anti-corrosion layer and an outer protection layer which are sequentially arranged on the outer side of the cable core; the cable core comprises a conductor, a semi-conductive polypropylene conductor shielding layer, a polypropylene insulating layer and a semi-conductive polypropylene insulating shielding layer which are sequentially arranged from inside to outside; the semi-conductive polypropylene conductor shielding layer is extruded on the outer surface of the conductor through a semi-conductive polypropylene shielding material, and the polypropylene insulating layer is extruded on the outer surface of the semi-conductive polypropylene conductor shielding layer through a polypropylene insulating material. The semi-conductive polypropylene insulation shielding layer is extruded on the outer surface of the polypropylene insulation layer through a semi-conductive polypropylene shielding material; and an optical cable temperature measurement unit is arranged in the metal shielding layer.

Description

Technical Field

[0001] The invention belongs to the technical field of power cables, and in particular relates to a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable and a manufacturing method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] High-voltage power cables are an important part of the power transmission and distribution network of the power system, and play an important role in the transmission and distribution of electric energy. The insulation layer of high-voltage power cables is generally made by extrusion using cross-linked polyethylene (XLPE) as the raw material. At present, more than 96% of high-voltage cables are XLPE insulated cables. However, when XLPE is used as a cable insulation material, there are certain defects: 1) XLPE is a thermosetting material, which cannot be recycled and reused during waste treatment, is not easy to degrade, and produces white garbage; 2) Cross-linking is required during the production process, and for high-voltage cables, the cross-linking pipeline is long and the temperature is high. It takes a certain amount of time and temperature to degas, and the energy consumption cost is high. During this period, by-products such as cumyl alcohol, acetophenone, alpha methyl styrene or methane and other wastes and exhaust gases pollute the environment. When a large number of cross-linked polyethylene cables are about to reach the end of their service life, they are faced with the problem of difficult recycling and treatment. Under the concept of environmental protection and energy saving, the research and development of polypropylene cables has become a consensus in the cable industry.

[0004] When polypropylene (PP) material is used as the raw material for the insulation layer of high-voltage cables, the cables have the following advantages:

[0005] (1) High temperature resistance: PP has a higher softening temperature than XLPE and a higher temperature resistance. According to data from research institutions, when PP is used as the raw material for the insulation layer, the long-term operating temperature of the cable can reach 105°C, which has the characteristics of high temperature resistance. Therefore, the research and development community generally believes that for cable products of the same specifications, the current carrying capacity of PP insulated cables can be increased by more than 10% compared with XLPE insulated cables.

[0006] (2) Energy saving: Compared with cross-linked polyethylene insulated cables, polypropylene insulated cables do not require the cross-linking process during production. For 110kV high-voltage cables, a three-layer co-extrusion direct processing process is adopted, which does not require the heating and cross-linking process, thus eliminating the large amount of energy consumption of cross-linking pipeline heating, degassing chamber heating and other devices, thereby reducing carbon emissions.

[0007] (3) Environmental protection: PP does not require cross-linking and degassing processes, which reduces energy consumption throughout the production process. Thermoplastic materials are recyclable and environmentally friendly. Studies have shown that the use of polypropylene insulated cables reduces manufacturing costs and carbon emissions compared to existing high-voltage XLPE cables.

[0008] (4) Economical: PP can be used as cable insulation material without cross-linking. During the production process, the three-layer co-extruded core can be directly wrapped after it comes off the line without the need for a degassing process. The turnover efficiency of cable production materials and equipment is improved, and the delivery efficiency is also improved simultaneously, which is a guarantee for both customers and production.

[0009] (5) Reliability: Since there is no cross-linking reaction in the production process, the problem of unstable insulation performance caused by the stability of the cross-linking process is avoided. Polypropylene materials do not contain additives such as cross-linking agents. Compared with cross-linked polyethylene, the material has a higher purity and can effectively reduce electrical trees, water trees, insulation micropores, impurities, scorch and other phenomena, which reduces the risk of insulation breakdown to a certain extent and improves the reliability of product operation.

[0010] However, the application of PP material as raw material for cable insulation layer is still blank in the cable industry, and there is no commercial PP insulated high-voltage power cable yet. There is also no verification method for improving the current carrying capacity and temperature resistance of PP insulated high-voltage power cable. Therefore, an intelligent temperature measurement type 110kV polypropylene insulated high-temperature resistant power cable is proposed. Summary of the invention

[0011] In order to solve the above problems, the present invention proposes a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable and a manufacturing method thereof. The insulation layer of the power cable adopts polypropylene material and adopts an improved manufacturing method, so that the power cable has excellent temperature resistance. An optical cable temperature measuring unit is arranged in the metal shielding layer to monitor the surface temperature of the cable core in real time, monitor the operating temperature of the power cable in real time, and improve the stability of high-temperature operation of the power cable.

[0012] According to some embodiments, the first solution of the present invention provides a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable, which adopts the following technical solution:

[0013] A 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable, comprising:

[0014] The power cable comprises a cable core arranged in the center, and a semiconductive water-resistant buffer layer, a metal shielding layer, a semiconductive water-resistant buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath arranged in sequence on the outside of the cable core; the cable core comprises a conductor, a semiconductive polypropylene conductor shielding layer, a polypropylene insulation layer and a semiconductive polypropylene insulation shielding layer arranged in sequence from the inside to the outside; the semiconductive polypropylene conductor shielding layer is extruded on the outer surface of the conductor through a semiconductive polypropylene shielding material, the polypropylene insulation layer is extruded on the outer surface of the semiconductive polypropylene conductor shielding layer through a polypropylene insulation material, and the semiconductive polypropylene insulation shielding layer is extruded on the outer surface of the polypropylene insulation layer through a semiconductive polypropylene shielding material; an optical cable temperature measuring unit is arranged in the metal shielding layer.

[0015] As a further technical limitation, the conductor is a compressed circular conductor or a stranded and split conductor; both the compressed circular conductor and the stranded and split conductor are formed by twisting single-filament wires made of copper, aluminum or aluminum alloy.

[0016] As a further technical limitation, the metal shielding layer includes aluminum wire shielding and optical cable temperature measuring units arranged at intervals, and the optical cable temperature measuring units are arranged symmetrically; an optical cable is arranged in the metal shielding layer.

[0017] As a further technical limitation, the thickness of the semi-conductive polypropylene conductor shielding layer and the semi-conductive polypropylene insulation shielding layer are both not less than 0.50 mm.

[0018] As a further technical limitation, the aluminum sheath adopts a smooth aluminum sheath structure or a corrugated aluminum sheath structure; the thickness of the smooth aluminum sheath is set to 1.8 mm, and the thickness of the corrugated aluminum sheath is set to 2.0 mm to 2.3 mm.

[0019] As a further technical limitation, the anti-corrosion layer is made of hot-melt adhesive material, and the hot-melt adhesive material is used to bond the aluminum sheath and the outer protective layer.

[0020] As a further technical limitation, the outer protective layer is made of polyethylene-based material, polypropylene-based material or polyvinyl chloride material; the thickness of the outer protective layer is set to 4mm to 5mm.

[0021] According to some embodiments, the second solution of the present invention provides a method for preparing the 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable provided in the first solution, using the following technical solution:

[0022] A method for manufacturing a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable comprises: sequentially arranging a semiconductive water-resistant buffer layer, a metal shielding layer, a semiconductive water-resistant buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath on a cable core; real-time monitoring of the surface temperature of the cable core is performed by an optical cable temperature measuring unit arranged in the metal shielding layer, and real-time monitoring of the operating temperature of the power cable is performed; the cable core adopts a three-layer co-extrusion production process, and the semiconductive polypropylene conductor shielding layer, the polypropylene insulation layer and the semiconductive polypropylene insulation shielding layer on the outer side of the conductor in the cable core are heated by an oil mold temperature machine set at 220°C respectively, and extrusion is completed by an extruder after reaching the set temperature to obtain the cable core.

[0023] As a further technical limitation, the preparation process of the cable core is:

[0024] Twisting multiple monofilaments to form a conductor;

[0025] Wrapping conductor tape around the outside of the conductor;

[0026] The conductor shielding layer, insulation layer and insulation shielding layer are extruded simultaneously through the polypropylene three-layer co-extrusion catenary production line.

[0027] As a further technical limitation, the extruder screw diameters of the semi-conductive polypropylene conductor shielding layer, polypropylene insulation layer and semi-conductive polypropylene insulation shielding layer in the cable core are 75mm, 175mm and 90mm respectively, the filter mesh numbers are 20 / 40 / 80 / 40 / 20, 40 / 80 / 150 / 300 / 150 / 80 / 40 / 20, and 20 / 40 / 80 / 40 / 20 respectively, and the zone temperatures are set to 160℃ / 180℃ / 190℃ / 200℃ / 200℃, 160℃ / 180℃ / 190℃ / 200℃ / 200℃ / 200℃, and 160℃ / 180℃ / 190℃ / 200℃ / 200℃ respectively, and the heating method is to connect the oil mold temperature machine with different zones of the machine head through a high temperature resistant rubber hose.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The insulating layer of the present invention adopts polypropylene material and an improved manufacturing method, so that the power cable has excellent temperature resistance. An optical cable temperature measuring unit is arranged on the metal shielding layer to monitor the surface temperature of the cable core in real time, monitor the operating temperature of the power cable in real time, and improve the stability of high-temperature operation of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable in Embodiment 1 of the present invention;

[0032] Among them, 1. Conductor; 2. Conductor shielding; 3. Polypropylene insulation; 4. Insulation shielding; 5. Semiconducting resistance water layer; 6-1. Metal shielding (aluminum wire); 6-2. Optical cable; 7. Semiconducting resistance water layer; 8. Smooth aluminum sheath; 9. Hot melt adhesive; 10. Non-metallic outer sheath; 11. Outer electrode (extruded). DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0037] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and they cannot be understood as limitations on the present invention.

[0038] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0039] Embodiment 1

[0040] Embodiment 1 of the present invention introduces a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable.

[0041] A 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable comprises a cable core arranged in the center, and a semiconductive resistive water buffer layer, a metal shielding layer, a semiconductive resistive water buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath arranged in sequence outside the cable core; the cable core comprises a conductor, a semiconductive polypropylene conductor shielding layer, a polypropylene insulation layer and a semiconductive polypropylene insulation shielding layer arranged in sequence from the inside to the outside; the semiconductive polypropylene conductor shielding layer is extruded on the outer surface of the conductor through a semiconductive polypropylene shielding material, the polypropylene insulation layer is extruded on the outer surface of the semiconductive polypropylene conductor shielding layer through a polypropylene insulation material, and the semiconductive polypropylene insulation shielding layer is extruded on the outer surface of the polypropylene insulation layer through a semiconductive polypropylene shielding material; an optical cable temperature measuring unit is arranged in the metal shielding layer.

[0042] As one or more embodiments, the conductor adopts a compact round conductor or a stranded and split conductor; the compact round conductor and the stranded and split conductor are both made of single-filament wires made of copper, aluminum or aluminum alloy. The conductor in this embodiment can be 1600mm 2 Watt-shaped five-section copper conductor.

[0043] As one or more implementation modes, the metal shielding layer includes an aluminum wire shielding and an optical cable temperature measuring unit arranged at intervals, and the optical cable temperature measuring units are symmetrically arranged; an optical cable is arranged in the metal shielding layer; the metal shielding layer is wound in a sequence of 8 optical cables evenly inserted between 40 aluminum wires, the outer diameter of the aluminum wire is 1.78 mm, and the outer diameter of the optical cable is 2.12 mm.

[0044] As one or more embodiments, the thickness of the polypropylene insulation layer at least meets the requirements of IEC60840;2020; the thickness of the semi-conductive polypropylene conductor shielding layer and the semi-conductive polypropylene insulation shielding layer are not less than 0.50 mm.

[0045] As one or more implementation modes, the aluminum sheath adopts a smooth aluminum sheath structure or a corrugated aluminum sheath structure; the aluminum sheath is an extruded smooth aluminum sheath, produced on an aluminum extruder, with a thickness of 1.4mm; the thickness of the smooth aluminum sheath is set to 1.8mm, and the thickness of the corrugated aluminum sheath is set to 2.0mm~2.3mm.

[0046] As one or more implementation modes, the anti-corrosion layer is made of hot-melt adhesive material, and the hot-melt adhesive material is used to bond the aluminum sheath and the outer protective layer.

[0047] As one or more implementation modes, the outer protective layer is made of polyethylene-based material, polypropylene-based material or polyvinyl chloride material; the thickness of the outer protective layer is set to 4mm to 5mm.

[0048] As one or more implementation modes, the semi-conductive polypropylene conductor shielding layer, the polypropylene insulation layer, and the semi-conductive polypropylene insulation shielding layer are respectively formed by 75 / 175 / 90 type screw extruders.

[0049] As one or more implementation modes, the semi-conductive polypropylene conductor shielding layer and the semi-conductive polypropylene insulation shielding layer use filter mesh numbers of 20 / 40 / 80 / 40 / 20.

[0050] As one or more embodiments, the polypropylene insulation layer uses a filter mesh number of 40 / 80 / 150 / 300 / 150 / 80 / 40 / 20.

[0051] As one or more embodiments, the extruder zone temperature of the semi-conductive polypropylene conductor shielding layer and the insulating shielding layer is 160℃ / 180℃ / 190℃ / 200℃ / 200℃; the extruder zone temperature of the polypropylene insulating layer is 160℃ / 180℃ / 190℃ / 200℃ / 200℃ / 200℃.

[0052] As one or more embodiments, the metal shielding layer is wound outside the semi-conductive water buffer layer using a 96-bobbin cage stranding machine.

[0053] This embodiment intends Figure 1 Taking the power cable structure as an example, from the inside to the outside, there are conductor 1, conductor shield 2, polypropylene insulation 3, insulation shield 4, semiconducting resistance water layer 5, metal shield (aluminum wire) 6-1, optical cable 6-2, semiconducting resistance water layer 7, smooth aluminum sheath 8, hot melt adhesive 9, non-metallic outer sheath 10 and outer electrode (extruded) 11; its structural dimensions are shown in Table 1.

[0054] Table 1 Structural dimensions

[0055]

[0056]

[0057] In this embodiment, the insulation layer of the power cable is made of polypropylene material, and an optical cable temperature measuring unit is set in the metal shielding layer to monitor the surface temperature of the cable core in real time, monitor the operating temperature of the power cable in real time, and improve the stability of high-temperature operation of the power cable.

[0058] Embodiment 2

[0059] The second embodiment of the present invention introduces a manufacturing method for preparing the 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable introduced in the first embodiment.

[0060] A method for manufacturing a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable comprises: sequentially arranging a semiconducting resistive water buffer layer, a metal shielding layer, a semiconducting resistive water buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath on a cable core; and monitoring the surface temperature of the cable core in real time by an optical cable temperature measuring unit arranged in the metal shielding layer, thereby monitoring the operating temperature of the power cable in real time.

[0061] As one or more implementation modes, the preparation process of the cable core is:

[0062] Twisting multiple monofilaments to form a conductor;

[0063] Wrapping conductor tape around the outside of the conductor;

[0064] The conductor shielding layer, insulation layer and insulation shielding layer are extruded simultaneously through the polypropylene three-layer co-extrusion catenary production line.

[0065] As one or more implementation modes, the cable core adopts a three-layer co-extrusion production process and is produced on a high-voltage catenary production line. The screw diameters of the extruders used are 75 mm, 175 mm, and 90 mm, respectively. The filter mesh numbers are 20 / 40 / 80 / 40 / 20, 40 / 80 / 150 / 300 / 150 / 80 / 40 / 20, and 20 / 40 / 80 / 40 / 20, respectively. The zone temperatures are set to 160°C / 180°C / 190°C / 200°C / 200°C, respectively.

[0066] 160℃ / 180℃ / 190℃ / 200℃ / 200℃ / 200℃, 160℃ / 180℃ / 190℃ / 200℃ / 200℃. The heating method is to connect five oil mold temperature controllers to different partitions of the machine head through high-temperature resistant rubber hoses. The temperature of the oil mold temperature controller is set to 220℃.

[0067] As one or more implementation modes, the three-layer co-extrusion production process of the cable core adopts the cooling method of nitrogen ventilation natural cooling + water cooling in the vulcanization pipeline, the nitrogen pressure is set to 0.8MPa, and the water level of the vulcanization pipeline is 28%±5%.

[0068] As one or more embodiments, the three-layer co-extrusion production process of the cable core includes starting rotary traction with a rotary length of 10 meters.

[0069] As one or more implementation modes, the metal shielding layer is twisted by a cage twisting machine.

[0070] As one or more embodiments, the aluminum sheath may be manufactured by extrusion or welding.

[0071] When the aluminum sheath uses a smooth aluminum sheath structure, the manufacturing process includes the following steps: forming the aluminum sheath on the outside of the semi-conductive buffer water-blocking layer by extrusion or welding, and forming a smooth aluminum sheath after reducing the diameter.

[0072] When the aluminum sheath adopts a corrugated aluminum sheath structure, the manufacturing process includes the following steps: forming the aluminum sheath on the outside of the semi-conductive buffer water-blocking layer by extrusion or welding, and forming the corrugated aluminum sheath after corrugation.

[0073] The manufacturing method in this embodiment uses polypropylene material as the raw material for the semi-conductive conductor shielding layer, the polypropylene insulation layer and the semi-conductive polypropylene insulation shielding layer, so that the power cable innovatively has the characteristics of green and environmental protection, and can be completely recycled and reused after use; in terms of manufacturing method, it also innovatively adopts the means of oil mold temperature machine heating to improve the extrusion capacity of the die head, and adopts the means of rotating traction and adjusting the cooling method to control the eccentricity of the polypropylene insulation layer. An optical cable temperature measuring unit is also provided to monitor the surface temperature of the cable core, which can intuitively reflect the effective improvement effect of the operating temperature of the cable conductor and the operating conditions.

[0074] The detailed steps are the same as the working principle of the 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable provided in Example 1, and will not be repeated here.

[0075] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable, characterized in that: The power cable comprises a cable core arranged in the center, and a semiconductive water-resistant buffer layer, a metal shielding layer, a semiconductive water-resistant buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath arranged in sequence on the outside of the cable core; the cable core comprises a conductor, a semiconductive polypropylene conductor shielding layer, a polypropylene insulation layer and a semiconductive polypropylene insulation shielding layer arranged in sequence from the inside to the outside; the semiconductive polypropylene conductor shielding layer is extruded on the outer surface of the conductor through a semiconductive polypropylene shielding material, the polypropylene insulation layer is extruded on the outer surface of the semiconductive polypropylene conductor shielding layer through a polypropylene insulation material, and the semiconductive polypropylene insulation shielding layer is extruded on the outer surface of the polypropylene insulation layer through a semiconductive polypropylene shielding material; an optical cable temperature measuring unit is arranged in the metal shielding layer.

2. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The conductor is a compressed circular conductor or a stranded and split conductor; both the compressed circular conductor and the stranded and split conductor are formed by twisting single-filament wires made of copper, aluminum or aluminum alloy.

3. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The metal shielding layer comprises aluminum wire shielding and optical cable temperature measuring units which are arranged at intervals, and the optical cable temperature measuring units are arranged symmetrically; an optical cable is arranged in the metal shielding layer.

4. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The thickness of the semi-conductive polypropylene conductor shielding layer and the semi-conductive polypropylene insulation shielding layer are both not less than 0.50 mm.

5. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The aluminum sheath adopts a smooth aluminum sheath structure or a corrugated aluminum sheath structure; the thickness of the smooth aluminum sheath is set to 1.8 mm, and the thickness of the corrugated aluminum sheath is set to 2.0 mm to 2.3 mm.

6. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The anti-corrosion layer is made of hot-melt adhesive material, and the hot-melt adhesive material is used to bond the aluminum sheath and the outer protective layer.

7. A 110kV temperature-measuring polypropylene insulated high temperature-resistant power cable as claimed in claim 1, characterized in that: The outer protective layer is made of polyethylene-based material, polypropylene-based material or polyvinyl chloride material; the thickness of the outer protective layer is set to 4mm to 5mm.

8. A method for preparing a 110 kV temperature-measuring polypropylene insulated high-temperature-resistant power cable as claimed in any one of claims 1 to 7, characterized in that: include: A semiconductive water-repellent buffer layer, a metal shielding layer, a semiconductive water-repellent buffer layer, an aluminum sheath, an anti-corrosion layer and an outer sheath are sequentially arranged on the cable core; the surface temperature of the cable core is monitored in real time by an optical cable temperature measuring unit arranged in the metal shielding layer, and the operating temperature of the power cable is monitored in real time; the cable core adopts a three-layer co-extrusion production process, and the semiconductive polypropylene conductor shielding layer, the polypropylene insulation layer and the semiconductive polypropylene insulation shielding layer on the outer side of the conductor in the cable core are heated by an oil mold temperature machine set at 220°C respectively, and the materials required for the production are extruded by an extruder after reaching the set temperature to obtain the cable core.

9. A method for manufacturing a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable as claimed in claim 8, characterized in that: The preparation process of the cable core is as follows: Twisting multiple monofilaments to form a conductor; Wrapping conductor tape around the outside of the conductor; The conductor shielding layer, insulation layer and insulation shielding layer are extruded simultaneously through the polypropylene three-layer co-extrusion catenary production line.

10. A method for manufacturing a 110kV temperature-measuring polypropylene insulated high-temperature-resistant power cable as claimed in claim 8, characterized in that: The screw diameters of the extruders of the semi-conductive polypropylene conductor shielding layer, the polypropylene insulation layer and the semi-conductive polypropylene insulation shielding layer in the cable core are 75 mm, 175 mm and 90 mm respectively; the filter mesh numbers are 20 / 40 / 80 / 40 / 20, 40 / 80 / 150 / 300 / 150 / 80 / 40 / 20 and 20 / 40 / 80 / 40 / 20 respectively; the zone temperatures are set to 160°C / 180°C / 190°C / 200°C / 200°C, 160°C / 180°C / 190°C / 200°C / 200°C / 200°C, and 160°C / 180°C / 190°C / 200°C / 200°C respectively; the heating method is to connect the oil mold temperature controller with different zones of the machine head through a high-temperature resistant rubber hose.

Images